I don't see very much talk about valve adjustments on newer machines. Is this a problem for our Rotax? I have a RZR 900 that needs the valve clearance checked at 2000 miles. I just hit 2000 mile on the RZR and I am having cold start problems. My X3 has 2000 miles so I wonder if I need to tear it apart and check the valve lash. Does anyone know if the adjustment involved shims and buckets?